Abstract
In addition to its value as a model system for studies on symbiotic nitrogen fixation, Medicago truncatula has recently become an organism of choice for dissection of complex pathways of secondary metabolism. This work has been driven by two main reasons, both with practical implications. First Medicago species possess a wide range of flavonoid and terpenoid natural products, many of which, for example, the isoflavonoids and triterpene saponins, have important biological activities impacting both plant and animal (including human) health. Second, M. truncatula serves as an excellent model for alfalfa, the world's major forage legume, and forage quality is determined in large part by the concentrations of products of secondary metabolism, particularly lignin and condensed tannins. We here review recent progress in understanding the pathways leading to flavonoids, lignin, and triterpene saponins through utilization of genetic resources in M. truncatula.
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